LED bulb is so great that the future WiFi or be replaced

Since the invention of Edison, tungsten filament bulbs have been serving people for more than a century, but with the advent of the LED lamp, it has been running out of time. LED lamp power consumption is only 1/10 of incandescent lamp, and the service life is its 30 times. Not only that, the use of LED lights is not limited to lighting, along with the invention of smart bulbs, it has been given more additional features, it can make your laptop, smart phone connected to the internet. Leave Wi-Fi, Li-Fi's coming.

In fact, the use of visible light for wireless communication is not a new idea. Everyone knows that on a desert island can be used smoke signals to attract attention; perhaps in the Napoleon era, few people know that Europe has been covering the optical telegraph, otherwise it would not call lights.

And by a wisp of smoke in the Morse code the way to partition, can form a distress message, visible light communication LI-Fi rapidly by adjusting the light intensity to the data compiled into binary 0 and 1. For example, LED open 1, said the closure of 0, can be transmitted through the fast switch information. But this does not mean that the Li-Fi transceiver will blink, because it is more than the speed of adjustment of the human eye recognition speed.

Wi-Fi vs Li-Fi

With the huge increase in the number of people using WiFi, a large number of WiFi data transmission for the existing radio and microwave frequency spectrum composed of WiFI technology brings great pressure. With the exponential growth of mobile devices, by 2019 is expected to be more than 10 billion devices, will exchange information around the 922 megabytes of 3372 trillion to $54 million 775 thousand and 808 (10 of the 18) bytes. Due to frequency congestion and electromagnetic interference, the current WiFi technology will not be able to achieve the transmission of this data. The most prominent problem is the urban areas, because the city's largest WiFi users.

The basic principle of communication is to carry out the maximum data transmission over the available electromagnetic band width. Radio frequency spectrum is widely used and managed, but there is not enough room to meet the growing demand of users. So Li-Hi has the potential to replace radio and microwave frequencies Wi-Fi.

For communication, the visible light spectrum is huge, unused and unsupervised. Diode generated light can be modulated very quickly: using a single blue LED, data rate up to 3.5 Gb/s. With white light can also reach 1.7Gb/s.

Unlike the Wi-Fi transmitter, optical communication is carried out in a closed room. This limitation seems to be the limitation of Li-Fi, but its key advantage is that it is very safe: no one outside the room after the curtain is hung up. An array of light sources on the ceiling can send different signals to different users. The transmitter power can be localized and can be used more efficiently, and will not affect the source of the adjacent Li-Fi. Radio frequency interference is indeed a big advantage over Wi-Fi. Visible light communication is very safe, and can make travelers do not have to switch his equipment to flight mode.

A further advantage of Li-Fi is that it can use existing power lines, such as LED lighting, so there is no need to build new infrastructure.

Help things burden

In the world of highly interconnected and all things can communicate with the object in the world, the Internet of things is a bold idea. For example, your refrigerator will send the message to your cell phone when the milk is over, or when it is about to expire. The sensor in the car tires excessive wear, or when the tire pressure is too low to inform you through the phone.

Because of the "goods" in the Internet of things, the sensors and controllers need to be used to connect the network. According to the forecast, by 2020 there will be 25 billion of such devices to connect, in fact, these things are mostly just a short distance connection, so Li-Fi will become a realistic solution.

Some companies have begun to provide visible light communications products. PureLii, based in Edinburgh, Li-1st, offers a secure wireless internet access with 11.5Mbps capacity - the equivalent of the first generation Wi-Fi plug and play solution. The other is from France's Oledcomm, using Li-Fi to connect with the hospital.

Although there are still many technical challenges, but now people have taken the first step to achieve Li-Fi. You can be sure that in the future you will switch on more things than just lighting.

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